I purchased an API freshwater test kit and got the following results:
7.2 - 7.4pH
0ppm Ammonia
0ppm Nitrite
30 - 40ppm Nitrate
Temperature holds at a steady 25 degrees C.
The fish seem to of stopped dieing now, i've 3 angel fish, 2 platys and the 4 tetras left. All seem ok but i'd like to...